Rikka with string
Accepts: 395
Submissions: 2281
Time Limit: 2000/1000 MS (Java/Others)
Memory Limit: 65536/65536 K (Java/Others)
问题描述
众所周知,萌萌哒六花不擅长数学,所以勇太给了她一些数学问题做练习,其中有一道是这样的:
有一天勇太得到了一...
要实现统计每日或每月的新增用户,但数据库中的存的时间是时间戳,所以就要利用DATE_FORMAT函数
数据库表存的数据:
要统计每日的新增用户 ,就要把时间戳格式的时间FORMAT成年-月-日的格式,并按照format过的字段做分组(group by),计算count
sql语句:
SELECT DATE_FORMAT(create_time,'%Y-%m-%d') as time...
分类:
数据库 时间:
2015-04-12 09:18:26
阅读次数:
224
Andy's First Dictionary
Time Limit: 3000MS
Memory Limit: Unknown
64bit IO Format: %lld & %llu
Submit Status
Description
Problem B: Andy's First Dictionary...
分类:
其他好文 时间:
2015-04-12 09:17:50
阅读次数:
108
神奇的进制转换
Time Limit: 1000 MS
Memory Limit: 32768 K
Total Submit: 248(150 users)
Total Accepted: 175(147 users)
Rating:
Special Judge: No
Description
x...
分类:
其他好文 时间:
2015-04-12 09:17:47
阅读次数:
146
Ananagrams
Time Limit: 3000MS
Memory Limit: Unknown
64bit IO Format: %lld & %llu
Submit Status
Description
Most crossword puzzle fans are used to anagrams--groups o...
分类:
其他好文 时间:
2015-04-12 09:16:22
阅读次数:
119
B.沼跃鱼
Time Limit: 500 MS
Memory Limit: 32768 K
Total Submit: 692 (336 users)
Total Accepted: 336 (305 users)
Special Judge: No
Description
fjxmlhx每...
分类:
其他好文 时间:
2015-04-12 09:15:29
阅读次数:
107
Rikka with string
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 214 Accepted Submission(s): 109
Problem Description
As we know...
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其他好文 时间:
2015-04-12 09:14:49
阅读次数:
114
队列列列列!!!!!
Time Limit: 1000 MS
Memory Limit: 32768 K
Total Submit: 337(148 users)
Total Accepted: 154(142 users)
Rating:
Special Judge: No
Description
...
分类:
其他好文 时间:
2015-04-12 09:14:25
阅读次数:
193
Team Queue
Time Limit: 3000MS
Memory Limit: Unknown
64bit IO Format: %lld & %llu
Submit Status
Description
Queues and Priority Queues are data structures which are ...
分类:
其他好文 时间:
2015-04-12 09:12:21
阅读次数:
150
Ugly Numbers
Time Limit: 3000MS
Memory Limit: Unknown
64bit IO Format: %lld & %llu
Submit Status
Description
Ugly numbers are numbers whose only prime factors are 2...
分类:
其他好文 时间:
2015-04-12 09:11:38
阅读次数:
131